{-# LANGUAGE CPP #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
module Agda.TypeChecking.Reduce.Monad
( constructorForm
, enterClosure
, underAbstraction_
, getConstInfo
, isInstantiatedMeta
, lookupMeta
, askR, applyWhenVerboseS
) where
import Prelude hiding (null)
import Control.Arrow ((***), first, second)
import Control.Applicative hiding (empty)
import Control.Monad.Reader
import qualified Data.Map as Map
import Data.Maybe
import Data.Monoid
import Debug.Trace
import System.IO.Unsafe
import Agda.Syntax.Common
import Agda.Syntax.Position
import Agda.Syntax.Internal
import Agda.TypeChecking.Monad hiding
( enterClosure, underAbstraction_, underAbstraction, addCtx,
isInstantiatedMeta, verboseS, typeOfConst, lookupMeta )
import Agda.TypeChecking.Monad.Builtin hiding ( constructorForm )
import Agda.TypeChecking.Substitute
import Agda.Interaction.Options
import qualified Agda.Utils.HashMap as HMap
import Agda.Utils.Lens
import Agda.Utils.Monad
import Agda.Utils.Null
import Agda.Utils.Pretty
#include "undefined.h"
import Agda.Utils.Impossible
gets :: (TCState -> a) -> ReduceM a
gets f = f . redSt <$> ReduceM ask
useR :: Lens' a TCState -> ReduceM a
useR l = gets (^.l)
askR :: ReduceM ReduceEnv
askR = ReduceM ask
localR :: (ReduceEnv -> ReduceEnv) -> ReduceM a -> ReduceM a
localR f = ReduceM . local f . unReduceM
instance HasOptions ReduceM where
pragmaOptions = useR stPragmaOptions
commandLineOptions = do
p <- useR stPragmaOptions
cl <- gets $ stPersistentOptions . stPersistentState
return $ cl{ optPragmaOptions = p }
instance HasBuiltins ReduceM where
getBuiltinThing b = liftM2 mplus (Map.lookup b <$> useR stLocalBuiltins)
(Map.lookup b <$> useR stImportedBuiltins)
constructorForm :: Term -> ReduceM Term
constructorForm v = do
mz <- getBuiltin' builtinZero
ms <- getBuiltin' builtinSuc
return $ fromMaybe v $ constructorForm' mz ms v
enterClosure :: Closure a -> (a -> ReduceM b) -> ReduceM b
enterClosure (Closure sig env scope cps x) f = localR (mapRedEnvSt inEnv inState) (f x)
where
inEnv e = env { envAllowDestructiveUpdate = envAllowDestructiveUpdate e }
inState s =
set stScope scope $ set stModuleCheckpoints cps s
withFreshR :: HasFresh i => (i -> ReduceM a) -> ReduceM a
withFreshR f = do
s <- gets id
let (i, s') = nextFresh s
localR (mapRedSt $ const s') (f i)
withFreshName :: Range -> ArgName -> (Name -> ReduceM a) -> ReduceM a
withFreshName r s k = withFreshR $ \i -> k (mkName r i s)
withFreshName_ :: ArgName -> (Name -> ReduceM a) -> ReduceM a
withFreshName_ = withFreshName noRange
addCtx :: Name -> Dom Type -> ReduceM a -> ReduceM a
addCtx x a ret = do
ctx <- asks $ map (fst . unDom) . envContext
let x' = unshadowedName ctx x
ce = (x',) <$> a
local (\e -> e { envContext = ce : envContext e }) ret
underAbstraction :: Subst t a => Dom Type -> Abs a -> (a -> ReduceM b) -> ReduceM b
underAbstraction _ (NoAbs _ v) f = f v
underAbstraction t a f =
withFreshName_ (realName $ absName a) $ \x -> addCtx x t $ f (absBody a)
where
realName s = if isNoName s then "x" else s
underAbstraction_ :: Subst t a => Abs a -> (a -> ReduceM b) -> ReduceM b
underAbstraction_ = underAbstraction dummyDom
lookupMeta :: MetaId -> ReduceM MetaVariable
lookupMeta i = fromMaybe __IMPOSSIBLE__ . Map.lookup i <$> useR stMetaStore
isInstantiatedMeta :: MetaId -> ReduceM Bool
isInstantiatedMeta i = do
mv <- lookupMeta i
return $ case mvInstantiation mv of
InstV{} -> True
_ -> False
{-# SPECIALIZE applyWhenVerboseS :: VerboseKey -> Int -> (ReduceM a -> ReduceM a) -> ReduceM a-> ReduceM a #-}
applyWhenVerboseS :: HasOptions m => VerboseKey -> Int -> (m a -> m a) -> m a -> m a
applyWhenVerboseS k n f a = ifM (hasVerbosity k n) (f a) a
instance MonadDebug ReduceM where
traceDebugMessage n s cont = do
ReduceEnv env st <- askR
unsafePerformIO $ do
_ <- runTCM env st $ displayDebugMessage n s
return $ cont
formatDebugMessage k n d = do
ReduceEnv env st <- askR
unsafePerformIO $ do
(s , _) <- runTCM env st $ formatDebugMessage k n d
return $ return s
instance HasConstInfo ReduceM where
getRewriteRulesFor = defaultGetRewriteRulesFor (gets id)
getConstInfo' q = do
ReduceEnv env st <- askR
defaultGetConstInfo st env q